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(No Model.) 2 Sheets- Sheet 1.

S. BERGMANN.

TELEPHONE SWITCH.

No. 266,750. 15% Patente WITNESSES: f INVENTOR:

(No Model.) I 2 SheetsSheet- 2. S. BERGMANN.

TELEPHONE SWITGH Patented Oct. 31, 1882.

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NITE STATES PATENT FFiQEO SIGMUND BERGMANN, OF NEW YORK, N. Y., ASSIGNOROF ONE-HALF TO EDWARD H. JOHNSON, OF SAME PLACE.

TELEPHONE-SWITCH.

SPECIFICATION forming part of Letters Patent No. 266,750, dated October31, 1882.

Application filed July 3, 1882. (No model.)

To all whom it may concern:

Be it known that I, SIGMUND BERGMANN, of New York city, in the countyand State of New York, have invented a certain new and usefulImprovement in Telephone-Switches, of which the following is aspecification.

The object I have in view is to produce simple and efficient meansforoperatingtelephoneswitches, without depending upon the weight of eitherthe receiver or transmitter to move the switch in one direction againstthe tension of a spring moving it in the other direction, as heretofore,and which means will be certain in action, not liable to get out oforder, and exceedingly convenient in'use. The invention consistsprincipally in utilizing the power of a permanent magnet, which isbrought into action when the telephone-receiver (or transmitter) isplaced in the position it is intended to occupy when not in use, andwhich permanent magnet acts to move the switch in one direction againstthe weight of the parts or the tension of a spring, by which the switchis moved in the other direction.

The invention consists, further, in the preferred means employed by mein this connection, as fully hereinafter explained.

In the accompanying drawings, forming a part hereof, Figure l is a sideelevation and partial vertical section of the switch, it being moved tothrow in the call; Fig. 2, a view of the switch from the contact;points,it being in the opposite position Fig. 3,atop view of the permanentmagnet and cont-act-sprin gs forming the switch-lever, and Fi 4 a viewsimilar to Fig. 1 of a modified form of the switch.

The switch-lever A is a horseshoe-magnet having three contact-springs, al) c, projecting from its yoke. This permanent-magnet lever ispreferably pivoted near its yoke in a horizontal position upon a plate,a, secured to the rear side of the door B of a telephone-box, and hasitsends orpolesprojectingthrough an opening in said door to the front sideof the door. The springs a, and I) make contact with adjustablescrew-contacts carried by arms d 0 above such springs, the weight of thepermanent magnet throwing such springs against the screws. The spring 0makes contact with a screw-contact carried by an arm,f, below it whenthe permanent magnet is raised at its poles.

0 represents a telephone-receiver, which, when notin use,is heldbyfingers g, secured upon the door B, and receiving the flange formed bythe flaring mouth-piece oftheinstrument. The receiver is provided with aring,D, of soft iron, secured thereto, (shown in sectionin thedrawings,)which ring is brought close to the poles of the permanent magnet, whenthe receiver is placed in the fingers, and, being attracted by suchpermanent magnet, the magnet itself is raised, working the switch andthrowingin the call. The horseshoe-magnet with both poles acting on theiron ring is more powerful than a simple straightpolarized bar would be.The use of a ring of iron upon the receiver has the ad vantage that theswitch will be thrown, no matter in what position the receiver is placedin the fingers. This ring may be put upon the receiver or transmitter,whichever is the movable instrument, or, if both are movable, uponeither or both.

The same connections are made with the plate a and the arms (I c j thatare made with the correspoudingpurts of the gravity-switch heretoforeemployed, so that the eifect of placing the receiver in the fingers orremoving it therefrom is to cut out the receiver and throw in the call,or the reverse. Those connections are as follows: Wire 1 is connectedwith the secondary of the induction-coil, the receiver, and the earth;wire 2 is connected with the primary of the induction-coil and thebattery; wire 3 is connected with the bell and earth; wire 4 isconnected with line, and wire 5 is connected with the transmitter andbattery.

Instead of using a polarized switch-lever, an iron lever may be used andthe permanentmagnet be placed upon the instrument. This may be theprojecting permanent magnet of the receiver or a special permanentmagnet secured to the receiver or transmitter.

Means will be provided to assure the placing the instrument in theholding-fingers in the proper position to bring the permanent magnetcarried thereby into the proper relation with the iron switch-lever.This modification is shown in Fig. 4. Thelever A is of softiron, and isattracted by the permanent magnet Z of the pony-crown receiver. A partof the space back of the flaring mouth-piece of the receiver is filledup, as shown at h, so that the receiver will always have a definiteposition in the fingers 9.

What I claim is-- 1. The combination, with a telephone-receiver (ortransmitter) and asupportingdevice thereof, of a switch and contacts,and a permanent magnet and armature moving such switch, and brought intoaction by the attachin g of such instrument to such supporting device,substantially as set forth.

2. In a telephone-switch, the combination, with a polarizedswitch-lever, of the movable instrument having an iron ring carriedthereby, substantially as and for the purpose set forth. a

'3. In a telephone-switch, the combination, with a movable instrumentprovidedwith an armature, of a pivoted horseshoe-magnet provided withcontacts and acting as the switchlever, substantially as set forth.

SIGMUN D BERGMANN.

Witnesses:

H. W. SEELY, P. B. WILBER.

